ka-backhand
You raise your hand high, like you’re about to throw a punch, but then you slap someone with the back of your hand, yell KA-BACKHAAAND, and act like you just discovered fire.
My brother ka-backhanded me when I said his pizza was burnt.
I ka-backhanded my friend because he wouldn’t stop roasting me.
My mom ka-backhanded me when I told her my dog ate her shoes.